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Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
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What are the various states through which a transaction passes through in its lifetime? Briefly discuss all the events that causes transition from one state to another. Ans:
Question: In a multi-user database environment, locking mechanisms can be used to solve the three basic problems of concurrency. On the other hand, however, locking may also le
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List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
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What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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